Need Help finding premade Exploits

I am trying to hack into a windows 2003 server machine. I have already found the ip address and operating system fingerprinting with nmap. I then used nessus to search for vulnerabilities and found a couple(one of them was netbios-ssn).

I know need to find a website that has a huge list of exploits(not buffer overflow exploits). I need exploits that will let me get into their system or at least to a point I can start trying to do brute force attacks on there passwords.

This by the way is a school project for my network security class and this windows 2003 box(plus a linux box, windows 2000 server box) have been setup so we can hack it for the project we must do.